EP1740870A1 - Conduite multicouche - Google Patents

Conduite multicouche

Info

Publication number
EP1740870A1
EP1740870A1 EP05738416A EP05738416A EP1740870A1 EP 1740870 A1 EP1740870 A1 EP 1740870A1 EP 05738416 A EP05738416 A EP 05738416A EP 05738416 A EP05738416 A EP 05738416A EP 1740870 A1 EP1740870 A1 EP 1740870A1
Authority
EP
European Patent Office
Prior art keywords
inner layer
tube
pipe according
pipe
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05738416A
Other languages
German (de)
English (en)
Other versions
EP1740870B1 (fr
Inventor
Peter Stadthalter
Uwe Schierjott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rehau Automotive SE and Co KG
Original Assignee
Rehau AG and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34966518&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1740870(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Rehau AG and Co filed Critical Rehau AG and Co
Publication of EP1740870A1 publication Critical patent/EP1740870A1/fr
Application granted granted Critical
Publication of EP1740870B1 publication Critical patent/EP1740870B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers

Definitions

  • the invention relates to pipes according to the preamble of claim 1, comprising at least two coaxial layers of thermoplastic polyolefins of the same type, which together form a pipe wall, but with different properties which are inseparably connected to one another.
  • Multilayer pipes are known from EP 0 869 304 B1, which consist of a base pipe made of polyethylene, a PE100 and an outer layer made of cross-linked polyethylene (PE-X), and in a further embodiment have a diffusion barrier layer against pollutants.
  • the thin and thus cost-reduced outer layer made of PE-X is intended to provide significantly improved abrasion behavior and higher point load resistance, which should enable trenchless laying techniques and sand bed-free laying with the associated risk of point loads.
  • the inner layer consists of a high-density polyethylene and the outer layer of a cross-linked polyethylene.
  • the notch sensitivity is to be reduced in order to increase the wear resistance and thereby improve the suitability for the trenchless laying technique.
  • Such pipes can be connected by welding using electric welding sleeves, although the welding quality is not harmless, but butt welding of these pipes is not possible.
  • the invention has for its object to show a generic pipe that has a further improved mechanical behavior compared to the prior art, in particular a significantly improved abrasion behavior and higher point load resistance, requires the same manufacturing effort and also has the possibility of blocking action against soil pollutants.
  • a multilayer pipe is proposed with an outer layer made of a standard polyethylene such as e.g. PE 80 or PE 100, which has an FNCT value of a single-layer standard pressure pipe and on the inner circumference of which there is an inner layer made of a polyethylene with an FNCT value that is at least about a factor of 4 higher.
  • a standard polyethylene such as e.g. PE 80 or PE 100
  • PE 80 or PE 100 which has an FNCT value of a single-layer standard pressure pipe and on the inner circumference of which there is an inner layer made of a polyethylene with an FNCT value that is at least about a factor of 4 higher.
  • the multilayer pipe according to the invention is characterized in that the FNCT value of the material of the inner layer has an FNCT- which is at least a factor of 4 higher. Value than that of the material of the outer layer of the tube.
  • the outer layer has a standardized outer diameter and a standardized ratio of outer diameter to total wall thickness (SDR) of approximately 10 to 20.
  • the tube according to the invention has a total wall thickness of the inner layer and the outer layer which is at least about 1% greater than the wall thickness of a standard tube according to EN 12201.
  • the tube according to the invention furthermore has a wall thickness of the inner layer of at least 5%. , preferably 10% to 20% of the total wall thickness of the tube.
  • Polyethylenes copolymerized with hexene and having a bimodal molecular weight distribution are particularly advantageous, and the tubes according to the invention are therefore preferably made from these materials with inner layers.
  • Polyethylenes such as polyethylene RT (raised temperature) are also advantageous for the inner layers of the tubes according to the invention. Due to their amorphous or crystalline structures and the side chains, the movements of the PE macromolecules against each other are hindered.
  • such a pipe according to the invention Since comparatively small wall thicknesses of the inner layer are sufficient to equip multi-layer pipes equipped therewith as having very good point load resistance, such a pipe according to the invention has practically the properties of a pipe which consists entirely of a cross-linked polyethylene; Like these pipes, it can therefore be exposed to a point load for the entire duration of the standard life expectancy without failing, so it can be installed at low cost without sand bedding.
  • Another advantage of this embodiment is the increased resistance to slow crack propagation after damage to the outer layer during storage, transport or - in particular trenchless - laying.
  • the combination of a slightly increased wall thickness and a material of the inner layer with an FNCT value that is at least about a factor of 4 higher, which is particularly resistant to crack propagation, allows the production of a pipe whose sensitivity to the propagation of external notches only depends on those costly pipes that are made entirely of cross-linked polyethylene.
  • the pipe according to the invention offers increased resistance to conventional single-layer and multi-layer pipes made of non-crosslinked polyethylenes, since in this form of failure the breakage of the pipe also starts from the inner layer.
  • the formation of the inner layer also enables a multi-layer tube with an outer layer, the dimensions of which are relevant standards such as conforms to EN 12201 to be equipped with an additional inner layer without the inner diameter of this pipe being reduced more than insignificantly.
  • an outer layer the dimensions of which are relevant standards such as conforms to EN 12201 to be equipped with an additional inner layer without the inner diameter of this pipe being reduced more than insignificantly.
  • this embodiment according to the invention has another advantage; despite international harmonization and standardization, the approval of pressure pipes in various countries is still time-consuming and costly. Because the pipe according to the invention and the preferred embodiments are based on a pipe which is standardized per se and has an additional inner layer, these expenses for the approval of pressure pipes are eliminated.
  • the inner layer is constructed in the manner described above in such a way that it has a barrier action against hydrocarbons.
  • An additional optical design of the surface is also part of the scope of the invention, as are pipes which have colored strips on the outer circumference.
  • the inner layer and / or the outer layer is antistatically or electrically conductive.
  • the antistatic treatment of the layers of the tube with a surface resistance of at least 10 "10 Ohm / cm is usually sufficient.
  • the inner layer of the multilayer pipe according to the invention has an FNCT value that is at least about a factor of 4 higher than the outer layer, which has the FNCT value of a single-layer standard pressure pipe.
  • this multilayer pipe has an inner layer made of polyethylene with a wall thickness of approximately 0.7 mm, with an FNCT value of approximately 6,000 h, at 80 ° C., 4.0 MPa and in the presence of 2% wetting agent Arkopal®.
  • this multilayer pipe according to the invention allows it to be laid in excavated material without sand bedding, without failing due to stress cracks within the standard life expectancy.
  • this multilayer pipe according to the invention has increased resistance to slow crack propagation of grooves or notches formed on the outer layer.
  • this multilayer pipe according to the invention With a groove depth of about 2 mm, at an internal pressure of 9 bar at 80 ° C., the service life of this multilayer pipe according to the invention of more than 360 h is achieved.
  • a full-wall pipe according to EN 12201 made of PE 100 fails after 8 hours in this test and a three-layer pipe according to DE 200 10 111 U1 with an outside diameter of 110.2 + 0.5 mm and a wall thickness of 10.1 + 0 , 4 mm after 180 h.
  • This pipe is also significantly more resistant to rapid crack propagation.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Lasers (AREA)
EP05738416A 2004-04-28 2005-04-22 Conduite multicouche Revoked EP1740870B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202004006812U DE202004006812U1 (de) 2004-04-28 2004-04-28 Mehrschichtiges Rohr
PCT/EP2005/004366 WO2005106307A1 (fr) 2004-04-28 2005-04-22 Conduite multicouche

Publications (2)

Publication Number Publication Date
EP1740870A1 true EP1740870A1 (fr) 2007-01-10
EP1740870B1 EP1740870B1 (fr) 2008-06-25

Family

ID=34966518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05738416A Revoked EP1740870B1 (fr) 2004-04-28 2005-04-22 Conduite multicouche

Country Status (4)

Country Link
EP (1) EP1740870B1 (fr)
AT (1) ATE399285T1 (fr)
DE (2) DE202004006812U1 (fr)
WO (1) WO2005106307A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006012608U1 (de) * 2006-08-16 2007-12-27 Rehau Ag + Co. Mehrschichtiges Rohr
DE202006012609U1 (de) * 2006-08-16 2007-12-27 Rehau Ag + Co. Mehrschichtiges Rohr
DE202006012610U1 (de) * 2006-08-16 2007-12-27 Rehau Ag + Co. Mehrschichtiges Rohr
DE202008015520U1 (de) * 2008-11-22 2010-04-22 Rehau Ag + Co Kunststoffrohr

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60245898A (ja) * 1984-05-22 1985-12-05 Mitsui Petrochem Ind Ltd 超高分子量ポリエチレン製フレキシブルチユ−ブ、溶融流動性の悪い熱可塑性樹脂製チユ−ブの製造方法及びその製造装置
FR2720472B1 (fr) * 1994-05-31 1996-07-12 Hutchinson Tuyau de transport de carburant.
JPH09133268A (ja) * 1995-11-08 1997-05-20 Sekisui Chem Co Ltd ポリエチレン複層管
DE29622414U1 (de) 1996-12-24 1997-04-03 Rehau Ag + Co, 95111 Rehau Rohr aus thermoplastischem Kunststoff
EP0869304B1 (fr) 1996-12-24 2002-06-05 REHAU AG + Co Tuyau en thermoplastique
DE29906998U1 (de) * 1999-04-20 1999-07-01 Wavin B.V., Zwolle Zweischichtiges Rohr
DE20010111U1 (de) * 2000-06-08 2001-10-31 Wavin B.V., Zwolle Mehrschichtiges Rohr
EP1199161A1 (fr) * 2000-10-20 2002-04-24 SOLVAY POLYOLEFINS EUROPE - BELGIUM (Société Anonyme) Tuyau en polyéthylène
DE10065177A1 (de) * 2000-12-23 2002-06-27 Degussa Mehrschichtverbund auf Polyamid/Polyolefin-Basis
DE10136286A1 (de) * 2001-02-23 2002-09-12 Ems Chemie Ag Thermoplastische Blockcopolymere aus Polyalkyl(meth)acrylat- und Polyamidsegmenten sowie deren Verwendung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005106307A1 *

Also Published As

Publication number Publication date
WO2005106307A1 (fr) 2005-11-10
DE502005004530D1 (de) 2008-08-07
DE202004006812U1 (de) 2005-09-08
EP1740870B1 (fr) 2008-06-25
ATE399285T1 (de) 2008-07-15

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